electronic PCB boards be manufactured using sustainable materials

Printed circuit boards (PCBs) house and interconnect chips, transistors and other components. They are crucial in ensuring the efficient operation of electronic devices, such as mobile phones, computers and automotive electronics. But they aren’t without their flaws – particularly from an ecological standpoint. In fact, they comprise a large portion of the hazardous, difficult-to-recycle components known as e-waste1.

Traditionally, PCBs consist of glass fiber sheets coated in epoxy plastic similar to the epoxy glues found at hardware stores. This composite material provides the heat and chemical resistance necessary for electronic pcb board components to function properly. But the glass and plastic can’t be easily separated, so they end up as e-waste, piling up in landfills or sent to developing countries where workers attempt to extract valuable metals like gold and copper from the waste, burning the remainder to the point of complete destruction2.

PCB assembly requires soldering, a technique that melts and bonds the metal pins on the components with their landing pads on the board. Traditional solder contains high levels of lead and other toxic materials that are harmful to both human and environmental health. Soldering using less toxic and volatile organic compounds, however, significantly reduces the ecological impact of PCB manufacturing.

Can electronic PCB boards be manufactured using sustainable materials

The use of recycled materials is another important component in sustainable PCB production. Reusing copper used in etching and stripping solutions, and tin in tin-lead soldering, allows the materials to be reused rather than discarded as e-waste. This practice also minimizes the need for new raw materials, thereby decreasing a manufacturer’s carbon footprint.

To further reduce the ecological footprint of their PCBs, manufacturers can opt to use eco-friendly inks and coatings that contain fewer VOCs (volatile organic compounds). These alternatives eliminate or greatly limit the amount of harmful chemicals used during production, thereby lowering a company’s energy consumption. The use of selective soldering techniques also cuts down on wasted solder, further reducing the overall environmental impact of the production process.

Other initiatives that can be taken to promote sustainability in electronic PCB production include implementing lean manufacturing processes and switching to renewable energy sources. Streamlining production and eliminating unnecessary steps reduces energy consumption, while upgrading to energy-efficient equipment decreases emissions. In addition, many PCB manufacturers are now offering to measure and disclose their carbon footprint, helping customers make informed purchasing decisions based on a company’s environmental commitments.

The quest for environmentally conscious electronic PCBs continues to evolve, with a growing focus on using sustainable materials and design practices, as well as on encouraging the reuse and recycling of components. A recent study published in Nature Sustainability shows that it’s possible to build a greener PCB with a modular design, enabling parts to be separated and reused as needed.

Researchers are tackling other ways to reduce the ecological impact of electronics, including finding new raw materials for fabrication that don’t pose a threat to the environment, and developing conductive inks that can be used for connecting the individual components on the PCB. One promising approach involves the use of nanofibrillated cellulose, a material derived from wood pulp. Research led by Claudia Som of Empa’s Technology and Society lab is investigating the use of this material for sustainable printed circuit boards. The EU project Hypelignum, meanwhile, aims to develop prototypes of PCBs made from renewable and compostable raw materials.